// Using a CheckboxGroup.// This code lets you select one of three types// of flower with three radio buttons.// The CheckboxGroup itself is not visible.// It does not draw a line around the CheckBoxes, for example.// It just ensures only one option is selected// at a time.// It is up to you to layout the CheckBoxes in some// logical pattern that indicates they belong together.import java.awt.Checkbox;import java.awt.CheckboxGroup;import java.awt.event.ItemEvent;import java.awt.event.ItemListener;/* ... */CheckboxGroup flowers;Checkbox daffodil;Checkbox impatiens;Checkbox sunflower;/* ... */flowers = new CheckboxGroup();daffodil = new Checkbox("daffodil", flowers, true );impatiens = new Checkbox("impatiens", flowers, false );sunflower = new Checkbox("sunflower", flowers, false );ItemListener flowerListener = new ItemListener(){public void itemStateChanged(ItemEvent e ){Checkbox picked = flowers.getSelectedCheckbox();boolean hePickedDaffodils = daffodils.getState();/* ... */}};daffodil.addItemListener(flowerListener );impatiens.addItemListener(flowerListener );sunflower.addItemListener(flowerListener );// Note you can't attach the Listener to the CheckGroup itself./* ... */